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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4af92af9190fbba7bc2d7bf0ed5329cec62a8203d26857a5c89fee8d78417268' 
  AND token = '3rc8Gfk0Q9bm/+J1JXjdEmdJZBt4J+ioyXxPFoGg+Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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