SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c6d18f651445a744b0f9ccadf0e606a5aaf6f7e186a32c885e8a2c178fb5d81' 
  AND token = 'fvcUj72U9u2DsN3yFa3fUzT5On+2FkxCocrl3fKg+VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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