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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869ee99d4219fbab5d8e3a472f93095ae72fd6d1ba64a3b1240234d14ee6e12b' 
  AND token = 'aUHbbTVCb4NmMP0YnzvBgMjsyPcDCv7MB5W2/+Jy908=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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