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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '930d23adb68eb24792b7d4f67e85ce1389165c4ddc40337ee8ec5541628fbb6b' 
  AND token = 'zmN2xjzqRLsq2wXs8CGbUiq4FILaNUycYK7Niq52s+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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