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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '221301d3a461b8788c49cdc781ccc5eb1dea98b3257c1e1de137b2390bc3fc97' 
  AND token = 'peezQj7uYC/A3MQzWCVldUa74yCoqLfxf+cFNHxz5Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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