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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '641a7af82335a3087a6477510f5807f2b5e466c0c9c792b40da6a1fb571ad677' 
  AND token = '5Qeg1gBJCHrVlQw7Zi7K1HgiO5uafsMyVBl9Yu49Yiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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