SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b178f82f5f157b3696aa3e28f4a57d3c1a3c7e0693ee28285fc4295a891cea17' 
  AND token = 'TFpQ6CvCpErCqAefHB9XMxzlR5duJItxwIub0v/s1Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

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