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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6282bacc82ce52b235702329e4c5d0697cb3bd985a63b66d49df4471db7f3a4a' 
  AND token = '2e4a+7lBLvp2RZ8GXbRLuMRky/eF9Jczd+3ETCmd948=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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