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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd602f83967cfb3714c9b794aff1367b29c6ebb6b482aa6ff03153653607e9129' 
  AND token = 'WuYjGeK1Xg3cFar542wnmmNkvIYpK41KXG59tmcwEvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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