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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5914e4e5f41e0a12c4e34a5e5fc6b428ad028f6150ac01e5e4900c9c874b5b59' 
  AND token = '47w7EvDJBhDSNX6HF8NX1m4iM/TbeDxm86uVvuvkN4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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