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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb9c07d265383dbca56f9b9a032903cb7356b1cae8108f57852b89f6fe5498f' 
  AND token = 'TXUmbvohPu5hs9Mq1NtAu4yGQldI7dONfbjuJEEv1Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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