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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175eb06244218cd6fcf459130b43ac8772db612646ab190b11b4727d266f4985' 
  AND token = 'OyYqIyGVGE/ei8TxAtxXKj970qfzXZR00yiAmt+zQbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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