SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92fb76c504ba2c7f99e150bada1faed9bf2c9e9feecbfe6aced154cca7435ec' 
  AND token = 'B70IRvpRmTizBInbu+PP6UDT3wWzC1JGDACj6psiQP4=' 
  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