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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce97392753e80d454914a3606d6ee10df229d377651e2a8998be41caf8170e4' 
  AND token = '61+n+sLRZSMikEZL9uzTgJEkyHPlhJp2ZZnxucx1eHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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