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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ecc19a0d9bd42ee8805f3f5f201021a98f68c7958c7b0669463240da228fb5' 
  AND token = 'Sb+KzB9vnraWyaMo2ELQB/s5j5dZlyIK8jr2Y1gVkfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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