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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847e8d9c354e4a29e9b4b565fe3b8ba1cf5741377b02a533e9a507e360fea2fc' 
  AND token = '8CR3+pkaCGYOXLQ6p4ytP8N90o8znRgkxxyU8b2k8+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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