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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac996d866d08247a67a4fa7120047545134648c901a2dc3c6720cb93f3fec8e5' 
  AND token = 'Kzjkhma1lRAq3yseAIYmqKcoqQ7hs8za7CS4JMExJEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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