SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe8308a8a018e106824d38e24164bf2093619ddeb5201434f183fe6989853ad' 
  AND token = '+zEet88XhCnbfk/cMlvMcuZzIs1/2/yBc5CfcXCvIfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables