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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5728bccaba557c9585acb0e486d6c86c3d30a415cabdf6bbc138d068b8ed6cf9' 
  AND token = 'Yb05Z3c/CVlanuxilIATYTFqFSaQBBz3xa5PNCRd9mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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