SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d1f16f803669e5c69d1a405288e5d576581222c44f31148a0927c659db3a13' 
  AND token = '+89u+zzEm0IKi2K/A44DVuDOPbZIv3vYgEbWcBOTh+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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