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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b8ed156d8e5e6559a99c6f474c9b8b58bbf550faff43d26fcc5bdfd2833a32f' 
  AND token = 'hvVo8q0VT5VIBZ1SkebWTHWVBCH81WZMZOM26kKA6lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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