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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c96066b10ec820ba60c5954f934256c330f7af4b6e9424bb64a4371c6d31418' 
  AND token = 'Gcm+EG4+qJMGCw3aG3SkC4OzI7FA2551Q5daWCz7Zdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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