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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671400eb0392f8c0ccd0e071744dd822db7dc56a4893f587df7c6b8de9d08ee9' 
  AND token = 'XfefW88SIqmt05GMr3wLNv8AmeSms4unGCVU3HueREI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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