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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18883718f3ddadfb429b72676fc7d781ff607c15560ef78c439dfbbb5df1ae2c' 
  AND token = 'HEq8fmtj0Fkjqvh7n+61U1Jeq7MU4tncxmn6Ur2BuxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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