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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4a7e879c4df10429dfb9eb46fe87857929dff928a735d8f4ba95a4b9647317' 
  AND token = '236kuvwE/G/rXPxMd3U1nkkJY88wFXsXJRTNlU/UuDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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