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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d7fd5c533a596db0a44b0fcad6062cf81f6a28b90443ed1456d4ca2d6f1260' 
  AND token = 'DR2kkB6tgQRtg1GlClaeYts0tqopWE5JFD6n5b/jNIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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