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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6dfd8aaab7dfd672a476208f7c6c79e3cc3e1b6845bfbaa0b6a28e6635aa9fe' 
  AND token = 'o6mewBs1hfaT+0j3zBlh+8iT0fYaNQf5FnLcG5gtddA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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