SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc05e9c62e79eeedea737bb5c196e53db420f5ecaf098a8f8139f9f5317fc1d7' 
  AND token = 'ldXJs4EpgnaRNKGN+MFz12Q6/kZoNSMXYkUDTlBZ3zQ=' 
  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