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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58520e76907280d97238a1d316ae970fbc0fbffff03b03bcffbcf61af3d594c9' 
  AND token = 'UoUwu/Ka8WcUdPl9RxHT7IKE7MTE/mfmmWRChEHadF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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