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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dec0d1dcc4d783f2b8b681921b22de0b2dfa14a7a2061706527ac9bcc7a5aa93' 
  AND token = 'mEg+diUzVmy1Y9Q+e8faNMmxQPLPyC8Ov531mmUwl6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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