SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abcbf0ac94ae2b69f41d3312a3012f6735f27ef76db67a015fc93b814d343646' 
  AND token = 'I0e/pPE8KCXRPJ2Vac5/jd7c1d/y4pi4m8q+Fnixo+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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