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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a088efac863cdc644a20ba782e9ec307ff3492a90b371c0a1a637819c71a8194' 
  AND token = '5Tr/JsL/tylXLyhMgsdqqJUp2a+7pK/kF11vdHbeFBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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