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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db41da484ed9b39601c5f8010f19057322628bab46bac8982940995c2d51fb1' 
  AND token = '396e3YSx6dahPS3PQs1RzU2TOqe85yJ36fIMJJqxpBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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