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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad96f888f84a1abb7768589e619be18a930e6352343ba4437af0b31f34e2389b' 
  AND token = 'yl3gaojKtfMFX/vBvpt9jbWq5FbQXEj2hr1cE+I0rOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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