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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61e7c1bc02e6978c9f9668c354cf1aadc34ed8a87ba6d93f9c559e9a6155b6b' 
  AND token = 'XdlwqBk1ZJCRUeGAMCS4OBKZfaVlQDAwJiUuV52XP00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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