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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed25b7e4d05d35e3bbb07e89863c97ac08a7d004a02cf1d49d7141700bc33ccf' 
  AND token = 'hD158hbHu/nNHknkNPkop9BepTxOMLlD328Zkt55tEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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