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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117baa16c26906dc35745bcd838500dd4fcff0d5ec9d608cd8658af1ac67fab4' 
  AND token = 'ol1eZB3KU/HrVbtPC2cSHsy3G5npx/oem7whpNU/olI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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