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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ebfad01ca35b1e5bf2b1df662831d82e74a16bc3fc73e17f9bd301f183093dd' 
  AND token = 'yvfnmGeZG44kAAUAjQZ65VFn9+DUTBQ4USEQkj4sfQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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