SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd530d2134e78e6f6fdf7aa3db9362c0f237274b71c49742c4fb16a5e9356c37e' 
  AND token = 'w7sow5+hnBJGsf2RkK/vt22FslvdpCawegc6rHkDqz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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