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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced911118f27b57b305c9afa1b08d7596ebc5853e5c01eab7e6724e81325c82d' 
  AND token = 'GLukexs/aon0oQKz5q/A+DNsIjUwOuOVzmX6Vi3O1DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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