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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7eed11b120929b4ef3b2ef58f4ba38f4502a6d17ffce701057fea3b4ced7cd7' 
  AND token = 'Rrj0GL9y7V3bfOgXuic9eFJftrG2J7/1lqPM9I0o1cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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