SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffac77dc348aa834fac17c9c8e8c7c5310a1ae1226b00dbab3fe9397f4abda13' 
  AND token = 'ygOpif3yw+qJdDvpw6fPbJeqzw3+KRIuD6RfM017H4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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