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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69993f28797aa8254f013dfd0fceca2dd3a736352db5a3336bdd839595f7e34' 
  AND token = 'EsHf5tSvkFhbxmcQk453A5HwdMy+C8ClN861O9bc2oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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