SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dceab2c2a1272a73b2a6bd9cf22805a2b5996d1ed158c644559ad49c19e7efe' 
  AND token = 'jqovM4T8hMjJvswgoJAMy5A/Pk22ngOX3nCW91T+XKE=' 
  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