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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193f6203f2d4bc254c61a3fd5055c8e9a06474980d559e9497733e2b802b0d65' 
  AND token = '7j8Ly/qDwgr56HUzv8/xeMVgC2cbfUcMIL39HqGQTTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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