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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b48d94d3dc304e4d5f69ef03dc4dd0ae0283a69bdece480d290294471bce3529' 
  AND token = 'ZVKywwVBlrpHiVJ4QsP0walrFGVLFTS6hN30cKzKiWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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