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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fdc5c5c9bbe936599df5caa6388e90b04fc0a0827b4b3cd84578476be5792ef' 
  AND token = 'b444y2jwDqQ+eUAOiVbb6Lkbxbtj5+YKl0mV4+DcoZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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