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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a408d30777cf512fb6f597dd7c92bb4f84e8560166fb35328b8d3bb5dc7d60f' 
  AND token = 'DYECRqiBQBsHuaIkorhyjco57cBKo7IMS9fcmNzGs2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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