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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99954fa13fb6d288e1289f99e28a55ad19ac7a60ce057e75c434b988d5195d9c' 
  AND token = 'hn7DdljzdOEr8/STj5LluL+SNv8QHZmp0dN3aJ+jBnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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