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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6528bb8d5d966d13086b1f69b8654ed86337fc4ef33043a07c9e1af2dec90ac' 
  AND token = 'pw/9DK24tyY19i0LJ6F8CSI+fMbn42XeG5AaV1iQy6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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