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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8652921b24e623ae9caa1459f8cf473e8238afbe4656e1d22bbdfe12ba00a99' 
  AND token = '6C8NHgsNSDjXGdK+SwVid75+/4JLEBi+tpdILJ19Ng4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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