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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0127076f65234fe7e81da26488f4b7ceeef6aced7384d30083342f9df9cf62b' 
  AND token = 'ko/lG7X+Gz9kkwY1UZTNnVA6n3+RzlUXR/orwj7ewCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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