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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4933165a0a33041e86844d12b85858f1ce10b60c376a21f59c0bbd93bab415' 
  AND token = 'k/qMW3bUAOqWPVIlmuOcknt6qZRoCcLWNfiy0hLbd3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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