SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '263a7a46bdf8bf5bda60d4e5e9f0a6e96e35ae8e4d809154a63befa93b6b0716' 
  AND token = 'fOtr6oEpoRbv4AwSqVq7jMnNswtWAbw5zERlY+fZDbE=' 
  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