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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30d5e13b2e8ae7c85f2eddfacdb4a1dc3c25ea6068389ea629ae1e26f961278' 
  AND token = 'Lr6PLjgmCKES1uZ4qUBK7rTm+V3+pnAK3VNrlHYa14I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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