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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817c91f04b12e338fa0fa000e7aa964debc29a61a69710722a388be87f30c23d' 
  AND token = 'Qt+EhTGJKHs4sW3NGAVwHQllSOyGFktQE99sRGnBS24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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