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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12cd949e49ad9f53ebc3bf1613edba7f33d36fe66ffdcc82a6a6b97dd14d1569' 
  AND token = '4PnURna9AGzv9RNF5cFhznNA2NSQh5jmi+FUa0VbjjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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