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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736bdf3aa7294163b054baa1ba04ad8047535aa16856438cfeed82d0b4d1413c' 
  AND token = 'ABV4aFWiJK2g9j9TL8XAeVZ77WUNMkoO1cER0eZz1n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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