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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a793007aa57d21e06ea2698929ea19fee13265fd59f38c2e383edae96613d4d' 
  AND token = 'RyDmuanucPgmk81onN9g6dDTHUvZwNf35hYNvaZ7dYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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