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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ec941c94bbb2d4852b338b41976ee28aa95f58ec293c3c76126890c531f01ab' 
  AND token = 'Fj12wETQv5xmQmJ/wslu0Yu1N8iSo/odlHo4ddt70Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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