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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df80a239200e724a5f58de4bc0834f5d9775aa83fdb82a192b34e456238b0bcf' 
  AND token = 'D7w7fb4JEQZ30rzqCQ9ZQSOQ3UBYsUKQf4wbureKgEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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