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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b734b2aad74fa0d23547b2492d6604e12636848f6af32bf293ddbb75107782b' 
  AND token = 'FCrjja8y/3ihyenoM+Rc4mB2p5hasVI01eneEJVnsis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}