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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773a4aae635ecd472a34da41af9d6bd7d6a02b26854b690806809ce9aa074b3d' 
  AND token = 'uuhkMxhG9BSbGvgWrwXlyCDEl9fViXGmGfbMS/ZBUzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

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