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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd66fa2236a6c4519ad33e58c8ef3667b525538c7ad16dd694dda08d6a78daa4f' 
  AND token = 'ey90Y9U/CL9fNDQWb1AJFWMQMp6RXrxnLZ52hG+yVw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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