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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d6db50a92d9aa9e3232a7b9d7c1b18a13de19c17c85d364ed54a3b8ab76bec' 
  AND token = 'hKZjwLx4YEKIseYtsyJ/yhlC9D0/JOUOVdcBpNcJavQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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