SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caba73e0c17bedda85c2d94153e27888f221838dbbeeaa786c56ad1452d49835' 
  AND token = 'IKbMxlF+yvJbjzrbmdQNDRKPieKArHTPI0u/hrWHy3Q=' 
  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