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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347a1b83b9c36d5b9f0a6ada084d9db7b33927bd9e556bab9f10abf876bbddef' 
  AND token = 'j657CONeJJ0KOLLTczcXDSrB3/j1zbtmkniWcm0pbfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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