SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b11a7f116e8f0f95f88196b858c40571ee47d523ae4aa0ed7b88fc3f418dd501' 
  AND token = 'zdRx77mYTSKf7jF3mrhMujPtvLLI7cc730q+63+03CM=' 
  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