SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2f0b94761cb3c60d8c28995831b132cc54642a234d00396685a74a76d0583a' 
  AND token = 'J7YTKobk4+zY/Bn/hxP5gPsF1I/qULdmgAklf06T4VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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