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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b60eb03e6e8dee975b1c7f81146f897418c046836e7e97e79d01eb9a8dc04b06' 
  AND token = '1Z9aVR310qnmzhdOQ4fwNCupx2J0smuu9mQAjz6w/70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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