SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '420eef3110699c470dcdbabae3889ffacebc39f4613b655e24b64a811ccd9df6' 
  AND token = 'lzi54prg6nyj2GzombStAdwjShNAjnF+JV/K4p6CYXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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