SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1089f33af081b70d39d400253635179752f0bff526a1e53b4fc43c17dfe92eba' 
  AND token = 'kRfHWNnXwF/dfaw3vxl/WnsNYkBJ9B2+1/hGAq0qHow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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