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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '784ea40b4270f00cbfcb0609ace2e2ebdc2cda65f8439bfc7ab34f47a55c8d5e' 
  AND token = 'h92A0FaHeRX8zvgotEeMtkTNtkRChUyhHouBu5a8Mc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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