SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0faecec602714e5605f2b30f4e6d6276e881f4dffc3ceda6d77b2cd7efe00a4' 
  AND token = 'HC+lmmaX2CWMfENhS/0ukpTASCGLc2hYALTlAtq1rB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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