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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e54121c7c68944f3a3759a4001269b362b32c87567c61bb744c05a42dae3bc8' 
  AND token = 'Yqcd0QzHBCDu6yC/Y4pLSZ2RzYWLkgcqXVW3PLER4+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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