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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5f2b17c895808d31de6cc5f9be5cf1b3341340ef9a7340c30bd4bb5fde2f08' 
  AND token = 'inGQa+/Sx6d7xjh4Ix62JgFtCRlcvxnauiQQvNPxIbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}