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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a87ffb7f85cf177548fc5d49611863a6ad28d4fc16071dd9b7ab46e3c1cf9f15' 
  AND token = 'HlmuMVij3dvTB/QBy5kLC9fSP7CM+tR5CbYm6bRX5HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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