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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcd1ba5d56b4016c93f2243c4e594d7b362a9bc4d299b363735b97cac07a8ba' 
  AND token = '0Sob8Rva8+qwblzZ7xkqI8UGfwf0tS01Tg3PtENJqoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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