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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d9123d13b8ce667bf4b9978023255d6a885cfa2fdf1a71d802dd601b303477' 
  AND token = 'm///gf8iMf1FIhLoQ0yBCv7LmJ/UVMnrrmEwa1l9LQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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