SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b70c515845e7e5200d70d29b6a6b48eeca3b5b1229834e86716c0dcdd51ae4' 
  AND token = 'AbChZtqnXU6BqUNexKZvMA/aBfK91WxghSSHzus4U9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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