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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8c7a59ee74f50a35c1945b0195dedb68addadc95e469a0386f78f216ea9a55' 
  AND token = 'r0ehf1xiPM/4Ikj1kfv37rV75NtglvNz6RexyzxjBgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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