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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a7108977cf0f00f9583573c92ecd7fd25177c7e03503acc1b69854cbb22dfa' 
  AND token = 'TkHnPbHZWrJPZGvTZyODFHP923FwU+gwfXukJJID3V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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