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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c89accf8c66bed2b768f002d3d404b65f5b9b52622cb0a72198120d599de40cf' 
  AND token = 'yzxaBfw/wvTGp87VKsgmTWW6TknWGv4OCl/1ky1XDBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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