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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d8db3310e0adaa2a29900897955c893b1991fa4aa7e91a7c032d3f2d54f70a3' 
  AND token = '26SjKko/IeJjsvz8dhfluh/9wZh0fmV79YXQzVzqo1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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