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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b013d5e6f110e97fddb7fe73973a1c5e3a913600002cdc3ec4e6febdaab6b10a' 
  AND token = 'jwbBSfI2Xz8ciIfwS4KQhutx484BBIR32Z2mDRrLGvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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