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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e0efd4c828733b9266f9b11847602a11ec804ca0d88459f280913b6d230d89c' 
  AND token = 'cFVC27ojw5bz2WafYUwpd8LS4R6Iu/QfRqKf/Ql8aVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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