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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de0f30a49e025b3f7b8353635dd253c8a997e1122b9de5ca8e31042f1396bce' 
  AND token = 'aPCAQAlv5okUeJspbPEBNIaPmtipiBvZfIyqhkD/3rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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