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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb7e7a92dad7b3ab3c4419bc11950f97be5aa4943e6acb89a9548d78603f686' 
  AND token = 'XIG20MkR4fTw5giY2cJvpzN/J+qtiqaWedaoA8F1aXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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