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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7761b40452ad8c54793f1f177701a4b241aadc2897659d085249856c886cf7d2' 
  AND token = 'oeLeFTLSW1qCHtaOcfbH6OesHeWoxxnLEGJKvOdHxlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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